Class II and Class 2 are two common safety concepts. However, for many beginners of LED drive power, Class II and Class 2 are relatively confusing safety concepts because of their consistent pronunciation. The two concepts come from two different standard systems:
Class II concept
Class II is mainly considering the type of insulation used in the protection against electric shock of the product. It is derived from the IEC standard system. The simple explanation is as follows: The safety standards of the lamps are divided into four categories: Class I, Class I, Class II and Class III.
Class 0 lamps
Relying on basic insulation as protection against electric shock - only by wire insulation. In case of basic insulation failure (wire breakage: broken skin when passing the line), it may cause electric shock and fire hazard. Protection against electric shock has to rely on the environment.
Class I lamps
The protection against electric shock not only relies on basic insulation, but also includes additional safety measures, that is, connecting the accessible conductive parts to the protective grounding conductors in the fixed line, so that the accessible conductive parts are not charged in the event of failure of the basic insulation ( Class 0 lamps + ground wire).
Class II lamps
Definition of Class II lamps:
Protection against electric shock not only relies on basic insulation, but also has additional safety measures, such as double insulation or reinforced insulation, but without grounding or protection depending on the installation conditions.